Cannot convert null literal to non-nullable reference type.

Nullability of reference types in return type of 'Task<User?> UserRepository.GetById(Guid id)' doesn't match implicitly implemented member 'Task<User> IGenericRepository<User, Guid>.GetById(Guid id)'.

Nullability of reference types in return type doesn't match overridden member.

'ApplicationDbContext.UserRoles' hides inherited member 'IdentityDbContext<User, Role, Guid, IdentityUserClaim<Guid>, IdentityUserRole<Guid>, IdentityUserLogin<Guid>, IdentityRoleClaim<Guid>, IdentityUserToken<Guid>>.UserRoles'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword.

'StorageRepository.Delete(Guid)' hides inherited member 'GenericRepository<Resource, Guid>.Delete(Guid)'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword.

'StorageRepository.Update(Resource)' hides inherited member 'GenericRepository<Resource, Guid>.Update(Resource)'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword.

'StorageRepository.Add(Resource)' hides inherited member 'GenericRepository<Resource, Guid>.Add(Resource)'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword.

'StorageRepository.GetAll()' hides inherited member 'GenericRepository<Resource, Guid>.GetAll()'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword.

'StorageRepository.GetById(Guid)' hides inherited member 'GenericRepository<Resource, Guid>.GetById(Guid)'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword.